不同孔径结构活性炭对低浓度甲醛的吸附性能研究  

Adsorption properties of low concentration formaldehyde on activated carbon with different pore size structures

作　　者：孟凡银 任海冰 蔡佳胜 邵宇[1] 郑华荣[1] Meng fanyin;Ren haibing;Cai jiasheng;Shao yu(State Key Laboratory of Photocatalysis on Energy and Environment,Research Institute of Photocatalysis,Fuzhou University,Fuzhou 350116,People's Republic of China)

机构地区：[1]福州大学能源与环境光催化国家重点实验室,福建福州350100

出　　处：《化学工程与装备》2023年第1期4-8,共5页Chemical Engineering & Equipment

基　　金：国家自然科学基金项目(21673044)。

摘　　要：针对室内低浓度甲醛(~0.2 mg/m^(3))的净化处理,选择两种不同孔径分布的活性炭,通过红外光谱(FT-IR)、比表面积及孔径(BET)测试和扫描电镜(SEM)分析,两种活性炭为同材质炭,孔容占比分别为:中孔炭(A)的微孔容积占比为9%(V_(Micro)/V_(Total)),中孔容积占比为91%(V_(Medium)/V_(Total));中微孔炭(B)的微孔容积占比为72%(V_(Micro)/V_(Total)),中孔容积占比为28%(V_(Medium)/V_(Total))。利用静态法评价装置对活性炭样品吸附低浓度甲醛性能进行测试。结果表明,湿度变化对活性炭吸附低浓度甲醛基本没有影响;小范围的温度变化对不同孔径活性炭的吸附速率有较大影响;多次注入低浓度甲醛的测试表明,中微孔炭的吸附容量要显著高于中孔炭;甲醛脱附测试表明,中微孔炭的脱附量远小于中孔炭,对比两种活性炭的孔容,可以认为,微孔孔容有助于低浓度甲醛的吸附和锁定。In order to purify indoor formaldehyde with low concentration (~0.2mg/m~3),two kinds of activated carbons with different pore size distribution were selected.Through FT-IR、BET and SEM analysis,the two activated carbons were of the same material,and the pore volume proportion was as follows:The microporous volume ratio of mesoporous carbon (A) is 9%(V_(Micro)/V_(Total)) and 91%(V_(Medium)/V_(Total)),and the microporous volume ratio of mesoporous carbon (B) is 72%(V_(Micro)/V_(Total)) and 28%(V_(Medium)/V_(Total)).The adsorption performance of activated carbon samples with low concentration of formaldehyde was tested by static method.The results showed that the change of humidity had no effect on the adsorption of formaldehyde in lowconcentration by activated carbon.The adsorption rate of activated carbon with different pore sizes is greatly affected by temperature variation in a small range.The results show that the adsorption capacity of mesoporous carbon is significantly higher than that of mesoporous carbon.Formaldehyde desorption test shows that the desorption amount of mesopore carbon is much smaller than that of mesopore carbon.Comparing the pore volume of two activated carbons,it can be considered that the pore volume of mesopore carbon is conducive to the adsorption and locking of small concentration of formaldehyde.

关 键 词：活性炭 孔径分布 低浓度 甲醛 

分 类 号：X51[环境科学与工程—环境工程] TU834.8[建筑科学—供热、供燃气、通风及空调工程]